Patent RU-2647577-C2 (RU)
Inventor: MOLDOVAN Kristyan-Tiberiu
IPC: F16K1/36
Filed: 2013-09-26
Granted: 2018-03-19
Abstract: FIELD: engines and pumps. 
     SUBSTANCE: group of inventions refers to gaseous medium flow controlling devices for gas distribution systems. Safety shut-off device comprises valve body having an inlet and an outlet openings, through which the gas flow is passing, the valve disc, the return pin and the guide bushing. Valve body comprises a valve seat, which surrounds the gas flow opening and is located between the inlet and outlet openings. Passage section is connected to the valve body and has an end face. Valve disc is located in the valve body and is made with possibility to move along the shut-off valve axis between the first open position at which the valve disc is retracted from the valve seat, and a second closed position in which the valve disc is adjacent to the valve seat, wherein the valve disc comprises radial portion of the protrusion. Return pin is functionally connected to the valve disc and is made with possibility to move along the shuttle axis relative to the valve body from the retracted position, in which the valve disc is in the first open position, into the driven position, in which the valve disc is in the closed second position. At that, the return pin is structurally driven into movement by the drive, which brings the return pin from the retracted position to the driven position. Guide bushing is attached to the valve disc and comprises a hollow cylindrical portion extending from the valve disc and at least partially enclosing the return pin. Guide bushing is structurally made with possibility to slide in the shutter body guide channel, connected to the valve body and supporting the return pin, thus providing additional structural integrity of the return pin and valve disc. Radial portion of the protrusion is made with possibility of abutment to the flow section end face when the valve disc is in the open position. In a second embodiment of the invention, the safety shut-off device comprises a shutter body, part of which is a passage section made with possibility to be connected to the valve body, wherein the passage section comprises an end face, return pin, valve disc and guide bushing. Return pin can move along the shutter axis from the retracted position, at which it is retracted into the shutter body, to the driven position, at which it extends from the shutter body to the driven position relative to the retracted position. Valve disc is functionally connected to the return pin end outside the passage section of the shutter body. At that, the design assumes the valve disc location inside the valve body, when the shutter body is connected to the valve body. Valve disc is made with possibility to move along the shutter axis between the first open position, in which the return pin is in the retracted position and closed second position, in which the return pin is in the driven position. Guide bushing is made with possibility to move along the shutter axis between the first retracted position, in which a large part of the guide bushing is located inside the guide channel, and the valve disc is in the open position, and an extended position in which most of the guide bushing is located outside the guide channel, and valve disc is in the closed position. In the third embodiment, the safety shut-off device comprises valve body having an inlet and an outlet ports, through which the gas flow passes, wherein the valve body comprises a valve seat that surrounds the gas flow opening and is located between the inlet and outlet ports, the valve disc, the return pin and the protection means. First means of the return pin protection against the destructive effect of the flow forces that occur in the valve body in the zone adjacent to the valve disc are performed on the valve disc. Valve disc comprises second means for the return pin and first protection means of protection means against the damaging effect of the flow forces occurring in the valve body in the region adjacent to the valve disc when the valve disc is in the open position. 
     EFFECT: safety shut-off device for gas flow control devices is proposed. 
     20 cl, 5 dwg